Encoding qubits into oscillators with atomic ensembles and squeezed light

Keith R. Motes*, Ben Q. Baragiola, Alexei Gilchrist, Nicolas C. Menicucci

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


The Gottesman-Kitaev-Preskill (GKP) encoding of a qubit within an oscillator provides a number of advantages when used in a fault-tolerant architecture for quantum computing, most notably that Gaussian operations suffice to implement all single- and two-qubit Clifford gates. The main drawback of the encoding is that the logical states themselves are challenging to produce. Here we present a method for generating optical GKP-encoded qubits by coupling an atomic ensemble to a squeezed state of light. Particular outcomes of a subsequent spin measurement of the ensemble herald successful generation of the resource state in the optical mode. We analyze the method in terms of the resources required (total spin and amount of squeezing) and the probability of success. We propose a physical implementation using a Faraday-based quantum nondemolition interaction.

Original languageEnglish
Article number053819
Pages (from-to)1-14
Number of pages14
JournalPhysical Review A
Issue number5
Publication statusPublished - 8 May 2017


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